When middle-aged barista Jamie and his girlfriend Clare befriend the younger couple Kit and Melia, there were lifestyle differences, but nothing to stand in the way of genuine camaraderie. Then Kit doesn't turn up for his ferry boat commute, and his wife reports him missing. As Jamie gets of the boat, he is being arrested on suspicion of murdering his friend. Sure, there had been an argument the previous day, but that has nothing to with this. And in this Hitchcockian thriller by the author of Our House, who exactly is this other passenger pointing the finger? What do any of these strangers know? "Louise Candlish is the queen of the sucker-punch twist."—Ruth Ware